drivers/crypto/qce/skcipher.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/moduleparam.h>
  10 #include <linux/types.h>
  11 #include <crypto/aes.h>
  12 #include <crypto/internal/des.h>
  13 #include <crypto/internal/skcipher.h>
  14
  15 #include "cipher.h"
  16
  17 static unsigned int aes_sw_max_len = CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN;
  18 module_param(aes_sw_max_len, uint, 0644);
  19 MODULE_PARM_DESC(aes_sw_max_len,
  20                  "Only use hardware for AES requests larger than this "
  21                  "[0=always use hardware; anything <16 breaks AES-GCM; default="
  22                  __stringify(CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN)"]");
  23
  24 static LIST_HEAD(skcipher_algs);
  25
  26 static void qce_skcipher_done(void *data)
  27 {
  28         struct crypto_async_request *async_req = data;
  29         struct skcipher_request *req = skcipher_request_cast(async_req);
  30         struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
  31         struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req));
  32         struct qce_device *qce = tmpl->qce;
  33         struct qce_result_dump *result_buf = qce->dma.result_buf;
  34         enum dma_data_direction dir_src, dir_dst;
  35         u32 status;
  36         int error;
  37         bool diff_dst;
  38
  39         diff_dst = (req->src != req->dst) ? true : false;
  40         dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
  41         dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
  42
  43         error = qce_dma_terminate_all(&qce->dma);
  44         if (error)
  45                 dev_dbg(qce->dev, "skcipher dma termination error (%d)\n",
  46                         error);
  47
  48         if (diff_dst)
  49                 dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
  50         dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
  51
  52         sg_free_table(&rctx->dst_tbl);
  53
  54         error = qce_check_status(qce, &status);
  55         if (error < 0)
  56                 dev_dbg(qce->dev, "skcipher operation error (%x)\n", status);
  57
  58         memcpy(rctx->iv, result_buf->encr_cntr_iv, rctx->ivsize);
  59         qce->async_req_done(tmpl->qce, error);
  60 }
  61
  62 static int
  63 qce_skcipher_async_req_handle(struct crypto_async_request *async_req)
  64 {
  65         struct skcipher_request *req = skcipher_request_cast(async_req);
  66         struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
  67         struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
  68         struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req));
  69         struct qce_device *qce = tmpl->qce;
  70         enum dma_data_direction dir_src, dir_dst;
  71         struct scatterlist *sg;
  72         bool diff_dst;
  73         gfp_t gfp;
  74         int ret;
  75
  76         rctx->iv = req->iv;
  77         rctx->ivsize = crypto_skcipher_ivsize(skcipher);
  78         rctx->cryptlen = req->cryptlen;
  79
  80         diff_dst = (req->src != req->dst) ? true : false;
  81         dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
  82         dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
  83
  84         rctx->src_nents = sg_nents_for_len(req->src, req->cryptlen);
  85         if (diff_dst)
  86                 rctx->dst_nents = sg_nents_for_len(req->dst, req->cryptlen);
  87         else
  88                 rctx->dst_nents = rctx->src_nents;
  89         if (rctx->src_nents < 0) {
  90                 dev_err(qce->dev, "Invalid numbers of src SG.\n");
  91                 return rctx->src_nents;
  92         }
  93         if (rctx->dst_nents < 0) {
  94                 dev_err(qce->dev, "Invalid numbers of dst SG.\n");
  95                 return -rctx->dst_nents;
  96         }
  97
  98         rctx->dst_nents += 1;
  99
 100         gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 101                                                 GFP_KERNEL : GFP_ATOMIC;
 102
 103         ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
 104         if (ret)
 105                 return ret;
 106
 107         sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
 108
 109         sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, req->cryptlen);
 110         if (IS_ERR(sg)) {
 111                 ret = PTR_ERR(sg);
 112                 goto error_free;
 113         }
 114
 115         sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg,
 116                              QCE_RESULT_BUF_SZ);
 117         if (IS_ERR(sg)) {
 118                 ret = PTR_ERR(sg);
 119                 goto error_free;
 120         }
 121
 122         sg_mark_end(sg);
 123         rctx->dst_sg = rctx->dst_tbl.sgl;
 124
 125         ret = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
 126         if (ret < 0)
 127                 goto error_free;
 128
 129         if (diff_dst) {
 130                 ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src);
 131                 if (ret < 0)
 132                         goto error_unmap_dst;
 133                 rctx->src_sg = req->src;
 134         } else {
 135                 rctx->src_sg = rctx->dst_sg;
 136         }
 137
 138         ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents,
 139                                rctx->dst_sg, rctx->dst_nents,
 140                                qce_skcipher_done, async_req);
 141         if (ret)
 142                 goto error_unmap_src;
 143
 144         qce_dma_issue_pending(&qce->dma);
 145
 146         ret = qce_start(async_req, tmpl->crypto_alg_type, req->cryptlen, 0);
 147         if (ret)
 148                 goto error_terminate;
 149
 150         return 0;
 151
 152 error_terminate:
 153         qce_dma_terminate_all(&qce->dma);
 154 error_unmap_src:
 155         if (diff_dst)
 156                 dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
 157 error_unmap_dst:
 158         dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
 159 error_free:
 160         sg_free_table(&rctx->dst_tbl);
 161         return ret;
 162 }
 163
 164 static int qce_skcipher_setkey(struct crypto_skcipher *ablk, const u8 *key,
 165                                  unsigned int keylen)
 166 {
 167         struct crypto_tfm *tfm = crypto_skcipher_tfm(ablk);
 168         struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
 169         unsigned long flags = to_cipher_tmpl(ablk)->alg_flags;
 170         int ret;
 171
 172         if (!key || !keylen)
 173                 return -EINVAL;
 174
 175         switch (IS_XTS(flags) ? keylen >> 1 : keylen) {
 176         case AES_KEYSIZE_128:
 177         case AES_KEYSIZE_256:
 178                 memcpy(ctx->enc_key, key, keylen);
 179                 break;
 180         }
 181
 182         ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
 183         if (!ret)
 184                 ctx->enc_keylen = keylen;
 185         return ret;
 186 }
 187
 188 static int qce_des_setkey(struct crypto_skcipher *ablk, const u8 *key,
 189                           unsigned int keylen)
 190 {
 191         struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk);
 192         int err;
 193
 194         err = verify_skcipher_des_key(ablk, key);
 195         if (err)
 196                 return err;
 197
 198         ctx->enc_keylen = keylen;
 199         memcpy(ctx->enc_key, key, keylen);
 200         return 0;
 201 }
 202
 203 static int qce_des3_setkey(struct crypto_skcipher *ablk, const u8 *key,
 204                            unsigned int keylen)
 205 {
 206         struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk);
 207         int err;
 208
 209         err = verify_skcipher_des3_key(ablk, key);
 210         if (err)
 211                 return err;
 212
 213         ctx->enc_keylen = keylen;
 214         memcpy(ctx->enc_key, key, keylen);
 215         return 0;
 216 }
 217
 218 static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
 219 {
 220         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 221         struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 222         struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
 223         struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
 224         int keylen;
 225         int ret;
 226
 227         rctx->flags = tmpl->alg_flags;
 228         rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
 229         keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
 230
 231         /* qce is hanging when AES-XTS request len > QCE_SECTOR_SIZE and
 232          * is not a multiple of it; pass such requests to the fallback
 233          */
 234         if (IS_AES(rctx->flags) &&
 235             (((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) ||
 236               req->cryptlen <= aes_sw_max_len) ||
 237              (IS_XTS(rctx->flags) && req->cryptlen > QCE_SECTOR_SIZE &&
 238               req->cryptlen % QCE_SECTOR_SIZE))) {
 239                 skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 240                 skcipher_request_set_callback(&rctx->fallback_req,
 241                                               req->base.flags,
 242                                               req->base.complete,
 243                                               req->base.data);
 244                 skcipher_request_set_crypt(&rctx->fallback_req, req->src,
 245                                            req->dst, req->cryptlen, req->iv);
 246                 ret = encrypt ? crypto_skcipher_encrypt(&rctx->fallback_req) :
 247                                 crypto_skcipher_decrypt(&rctx->fallback_req);
 248                 return ret;
 249         }
 250
 251         return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
 252 }
 253
 254 static int qce_skcipher_encrypt(struct skcipher_request *req)
 255 {
 256         return qce_skcipher_crypt(req, 1);
 257 }
 258
 259 static int qce_skcipher_decrypt(struct skcipher_request *req)
 260 {
 261         return qce_skcipher_crypt(req, 0);
 262 }
 263
 264 static int qce_skcipher_init(struct crypto_skcipher *tfm)
 265 {
 266         /* take the size without the fallback skcipher_request at the end */
 267         crypto_skcipher_set_reqsize(tfm, offsetof(struct qce_cipher_reqctx,
 268                                                   fallback_req));
 269         return 0;
 270 }
 271
 272 static int qce_skcipher_init_fallback(struct crypto_skcipher *tfm)
 273 {
 274         struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 275
 276         ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(&tfm->base),
 277                                               0, CRYPTO_ALG_NEED_FALLBACK);
 278         if (IS_ERR(ctx->fallback))
 279                 return PTR_ERR(ctx->fallback);
 280
 281         crypto_skcipher_set_reqsize(tfm, sizeof(struct qce_cipher_reqctx) +
 282                                          crypto_skcipher_reqsize(ctx->fallback));
 283         return 0;
 284 }
 285
 286 static void qce_skcipher_exit(struct crypto_skcipher *tfm)
 287 {
 288         struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 289
 290         crypto_free_skcipher(ctx->fallback);
 291 }
 292
 293 struct qce_skcipher_def {
 294         unsigned long flags;
 295         const char *name;
 296         const char *drv_name;
 297         unsigned int blocksize;
 298         unsigned int chunksize;
 299         unsigned int ivsize;
 300         unsigned int min_keysize;
 301         unsigned int max_keysize;
 302 };
 303
 304 static const struct qce_skcipher_def skcipher_def[] = {
 305         {
 306                 .flags          = QCE_ALG_AES | QCE_MODE_ECB,
 307                 .name           = "ecb(aes)",
 308                 .drv_name       = "ecb-aes-qce",
 309                 .blocksize      = AES_BLOCK_SIZE,
 310                 .ivsize         = AES_BLOCK_SIZE,
 311                 .min_keysize    = AES_MIN_KEY_SIZE,
 312                 .max_keysize    = AES_MAX_KEY_SIZE,
 313         },
 314         {
 315                 .flags          = QCE_ALG_AES | QCE_MODE_CBC,
 316                 .name           = "cbc(aes)",
 317                 .drv_name       = "cbc-aes-qce",
 318                 .blocksize      = AES_BLOCK_SIZE,
 319                 .ivsize         = AES_BLOCK_SIZE,
 320                 .min_keysize    = AES_MIN_KEY_SIZE,
 321                 .max_keysize    = AES_MAX_KEY_SIZE,
 322         },
 323         {
 324                 .flags          = QCE_ALG_AES | QCE_MODE_CTR,
 325                 .name           = "ctr(aes)",
 326                 .drv_name       = "ctr-aes-qce",
 327                 .blocksize      = 1,
 328                 .chunksize      = AES_BLOCK_SIZE,
 329                 .ivsize         = AES_BLOCK_SIZE,
 330                 .min_keysize    = AES_MIN_KEY_SIZE,
 331                 .max_keysize    = AES_MAX_KEY_SIZE,
 332         },
 333         {
 334                 .flags          = QCE_ALG_AES | QCE_MODE_XTS,
 335                 .name           = "xts(aes)",
 336                 .drv_name       = "xts-aes-qce",
 337                 .blocksize      = AES_BLOCK_SIZE,
 338                 .ivsize         = AES_BLOCK_SIZE,
 339                 .min_keysize    = AES_MIN_KEY_SIZE * 2,
 340                 .max_keysize    = AES_MAX_KEY_SIZE * 2,
 341         },
 342         {
 343                 .flags          = QCE_ALG_DES | QCE_MODE_ECB,
 344                 .name           = "ecb(des)",
 345                 .drv_name       = "ecb-des-qce",
 346                 .blocksize      = DES_BLOCK_SIZE,
 347                 .ivsize         = 0,
 348                 .min_keysize    = DES_KEY_SIZE,
 349                 .max_keysize    = DES_KEY_SIZE,
 350         },
 351         {
 352                 .flags          = QCE_ALG_DES | QCE_MODE_CBC,
 353                 .name           = "cbc(des)",
 354                 .drv_name       = "cbc-des-qce",
 355                 .blocksize      = DES_BLOCK_SIZE,
 356                 .ivsize         = DES_BLOCK_SIZE,
 357                 .min_keysize    = DES_KEY_SIZE,
 358                 .max_keysize    = DES_KEY_SIZE,
 359         },
 360         {
 361                 .flags          = QCE_ALG_3DES | QCE_MODE_ECB,
 362                 .name           = "ecb(des3_ede)",
 363                 .drv_name       = "ecb-3des-qce",
 364                 .blocksize      = DES3_EDE_BLOCK_SIZE,
 365                 .ivsize         = 0,
 366                 .min_keysize    = DES3_EDE_KEY_SIZE,
 367                 .max_keysize    = DES3_EDE_KEY_SIZE,
 368         },
 369         {
 370                 .flags          = QCE_ALG_3DES | QCE_MODE_CBC,
 371                 .name           = "cbc(des3_ede)",
 372                 .drv_name       = "cbc-3des-qce",
 373                 .blocksize      = DES3_EDE_BLOCK_SIZE,
 374                 .ivsize         = DES3_EDE_BLOCK_SIZE,
 375                 .min_keysize    = DES3_EDE_KEY_SIZE,
 376                 .max_keysize    = DES3_EDE_KEY_SIZE,
 377         },
 378 };
 379
 380 static int qce_skcipher_register_one(const struct qce_skcipher_def *def,
 381                                        struct qce_device *qce)
 382 {
 383         struct qce_alg_template *tmpl;
 384         struct skcipher_alg *alg;
 385         int ret;
 386
 387         tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
 388         if (!tmpl)
 389                 return -ENOMEM;
 390
 391         alg = &tmpl->alg.skcipher;
 392
 393         snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
 394         snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
 395                  def->drv_name);
 396
 397         alg->base.cra_blocksize         = def->blocksize;
 398         alg->chunksize                  = def->chunksize;
 399         alg->ivsize                     = def->ivsize;
 400         alg->min_keysize                = def->min_keysize;
 401         alg->max_keysize                = def->max_keysize;
 402         alg->setkey                     = IS_3DES(def->flags) ? qce_des3_setkey :
 403                                           IS_DES(def->flags) ? qce_des_setkey :
 404                                           qce_skcipher_setkey;
 405         alg->encrypt                    = qce_skcipher_encrypt;
 406         alg->decrypt                    = qce_skcipher_decrypt;
 407
 408         alg->base.cra_priority          = 300;
 409         alg->base.cra_flags             = CRYPTO_ALG_ASYNC |
 410                                           CRYPTO_ALG_ALLOCATES_MEMORY |
 411                                           CRYPTO_ALG_KERN_DRIVER_ONLY;
 412         alg->base.cra_ctxsize           = sizeof(struct qce_cipher_ctx);
 413         alg->base.cra_alignmask         = 0;
 414         alg->base.cra_module            = THIS_MODULE;
 415
 416         if (IS_AES(def->flags)) {
 417                 alg->base.cra_flags    |= CRYPTO_ALG_NEED_FALLBACK;
 418                 alg->init               = qce_skcipher_init_fallback;
 419                 alg->exit               = qce_skcipher_exit;
 420         } else {
 421                 alg->init               = qce_skcipher_init;
 422         }
 423
 424         INIT_LIST_HEAD(&tmpl->entry);
 425         tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_SKCIPHER;
 426         tmpl->alg_flags = def->flags;
 427         tmpl->qce = qce;
 428
 429         ret = crypto_register_skcipher(alg);
 430         if (ret) {
 431                 kfree(tmpl);
 432                 dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name);
 433                 return ret;
 434         }
 435
 436         list_add_tail(&tmpl->entry, &skcipher_algs);
 437         dev_dbg(qce->dev, "%s is registered\n", alg->base.cra_name);
 438         return 0;
 439 }
 440
 441 static void qce_skcipher_unregister(struct qce_device *qce)
 442 {
 443         struct qce_alg_template *tmpl, *n;
 444
 445         list_for_each_entry_safe(tmpl, n, &skcipher_algs, entry) {
 446                 crypto_unregister_skcipher(&tmpl->alg.skcipher);
 447                 list_del(&tmpl->entry);
 448                 kfree(tmpl);
 449         }
 450 }
 451
 452 static int qce_skcipher_register(struct qce_device *qce)
 453 {
 454         int ret, i;
 455
 456         for (i = 0; i < ARRAY_SIZE(skcipher_def); i++) {
 457                 ret = qce_skcipher_register_one(&skcipher_def[i], qce);
 458                 if (ret)
 459                         goto err;
 460         }
 461
 462         return 0;
 463 err:
 464         qce_skcipher_unregister(qce);
 465         return ret;
 466 }
 467
 468 const struct qce_algo_ops skcipher_ops = {
 469         .type = CRYPTO_ALG_TYPE_SKCIPHER,
 470         .register_algs = qce_skcipher_register,
 471         .unregister_algs = qce_skcipher_unregister,
 472         .async_req_handle = qce_skcipher_async_req_handle,
 473 };